On physical examination, a newborn is found to have micrognathia, a prominent occiput, low-set ears, and rocker-bottom feet. There is very little mental development during the first months of life and the infant dies of cardiac complications after 8 months. A complete karyotype of this child would yield which of the following?
A. XO
B. XXY
C. Trisomy 13
D. Trisomy 18
E. Trisomy 21
A. XO
B. XXY
C. Trisomy 13
D. Trisomy 18
E. Trisomy 21